Fixing error C2338: Test writer must define specialization of ToString<> error

Visual Studio 2012 ships with a new Native C++ test framework. When writing tests and hitting a error message like this:
error C2338: Test writer must define specialization of ToString<const Q& q> for your class class
std::basic_string<wchar_t,struct std::char_traits<wchar_t>,class std::allocator<wchar_t> >
__cdecl Microsoft::VisualStudio::CppUnitTestFramework::ToString<SomeType>(const SomeType &).

You will have to impl. support for the missing type, that's easy to fix, just create a new file in your test project and impl. the function. Here is a quick example defining support for the custom type SomeType:

namespace Microsoft
{ 
    namespace VisualStudio
    { 
        namespace CppUnitTestFramework
        {
            template<> static std::wstring ToString<SomeType>(const SomeType& t) { RETURN_WIDE_STRING(t); }
        }
    }
}

Enjoy Native Unit testing!